package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;

import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang3.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService wareOrderTaskService;

    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    OrderFeignService orderFeignService;

    /**
     * 1.库存自动解锁
     *   下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚 之前锁定的库存就要自动解锁
     * 2.订单失败
     *   锁库存失败
     *
     * 只要解锁库存的消息失败。一定要告诉服务器解锁失败  手动告诉
     */
    @Override
    public void unlockStock(StockLockedTo to) {
        Long detailId = to.getDetailId();
        //查询数据库关于这个订单的锁定库存信息
        //没有：库存锁定失败，库存回滚了，无需解锁
        //有：证明库存锁定成功了
        //    解锁：查询订单情况
        //          1、没有这个订单 必须解锁
        //          2、有这个订单，如果订单状态已取消 必须解锁

        //有可能由于支付宝异步回调网路原因卡顿，还没来得急修改订单状态

        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId!=null){
            //解锁
            Long id = to.getId();//库存工作单id
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();

            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode()==0){
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data==null || data.getStatus()==4){//只解锁订单状态是取消状态
                    if (byId.getLockStatus()==1){
                        //当前库存工作单详情，为解锁的状态1 保证消息不被重复消费
                        unLockStock(byId.getSkuId(),byId.getWareId(),byId.getSkuNum(),detailId);
                    }
                }
            }else{
                //拒绝消息 告诉服务器消息未消费，true为重新放到队列中，让别人继续消费
                throw new RuntimeException("远程服务失败");
            }

        }else{
            //无需解锁
        }
    }

    /**
     * 防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期。
     * 查询订单状态为新建状态，什么都不走 导致永远不能解锁库存
     * @param to
     */

    @Transactional
    @Override
    public void unlockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        //查询最新库存状态，防止重复解锁库存
        WareOrderTaskEntity task=wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //安装工作单找到所有 没有解锁的库存 进行解锁
        List<WareOrderTaskDetailEntity> entities = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }

    private void unLockStock(Long skuId,Long wareId,Integer num,Long detailId){
        //库存解锁
        baseMapper.unlockStock(skuId,wareId,num,detailId);
        //更新库存工作单详情的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(detailId);
        entity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(entity);
    }


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (StringUtils.isNotBlank(skuId)){
            wrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if (StringUtils.isNotBlank(wareId)){
            wrapper.eq("ware_id",wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");

                if(info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }


            wareSkuDao.insert(skuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo skuHasStockVo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count=baseMapper.getSkuStock(skuId);
            skuHasStockVo.setSkuId(skuId);
            skuHasStockVo.setHasStock(count==null?false:count>0);
            return skuHasStockVo;
        }).collect(Collectors.toList());
        return collect;
    }

    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */

        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(wareOrderTaskEntity);

        //1.找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪个仓库有库存
            List<Long> longs=wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(longs);
            return stock;
        }).collect(Collectors.toList());

        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            boolean skuStocked=false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds==null || wareIds.size()==0){
                //没有任何仓库有这个商品的库存
                throw new RuntimeException(skuId+"--没有足够的库存");
            }
            //如果每一个商品都锁定成功，将当前商品锁定了几件的工作记录单发给MQ
            //锁定失败，前面保存的工作单信息就会回滚。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所有就不用解锁
            for (Long wareId : wareIds) {
                Long count=wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count==1){
                    skuStocked=true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
                    detailEntity.setSkuId(skuId);
                    detailEntity.setSkuNum(hasStock.getNum());
                    detailEntity.setTaskId(wareOrderTaskEntity.getId());
                    detailEntity.setWareId(wareId);
                    detailEntity.setLockStatus(1);
                    wareOrderTaskDetailService.save(detailEntity);

                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(wareOrderTaskEntity.getId());
                    lockedTo.setDetailId(detailEntity.getId());
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }
            }
            if (skuStocked==false){
                //没有任何仓库有这个商品的库存
                throw new RuntimeException(skuId+"--没有足够的库存");
            }
        }
        return true;
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;//仓库id
    }
}